Chop and change
Definition 1 of 1
Pro Tip 1/3Indecision
The phrase implies a lack of commitment and an inability to stick with choices. 
His habit to chop and change makes him unreliable as a project partner.
Pro Tip 2/3Negative Connotation
Often used negatively to suggest that constant changing is unhelpful or frustrating. 
The team's morale is low due to the manager's tendency to chop and change our roles.
Pro Tip 3/3British Usage
More commonly used in the UK, might be less familiar to English speakers from other regions. 
During my stay in London, I noticed that locals frequently used 'chop and change' in conversations.